Coil component, circuit board, and electronic device

Abstract

Disclosed herein is a coil component including a base body having a magnetic body portion containing a metal magnetic material, a conductor provided inside the base body, an insulating layer that is provided on a surface of the magnetic body portion in the base body and that is a resin containing carbon particles, and an external electrode that extends along the surface of the base body and that is connected to the conductor.

What is claimed is: 
     
         1 . A coil component comprising:
 a base body having a magnetic body portion containing a metal magnetic material;   a conductor provided inside the base body;   an insulating layer that is provided on a surface of the magnetic body portion in the base body and that is a resin containing carbon particles; and   an external electrode that extends along the surface of the base body and that is connected to the conductor.   
     
     
         2 . The coil component according to  claim 1 , wherein the insulating layer contains the carbon particles in an amount of higher than 0.01 vol %. 
     
     
         3 . The coil component according to  claim 1 , wherein the insulating layer contains an insulating inorganic filler. 
     
     
         4 . The coil component according to  claim 3 , wherein the insulating layer contains, as the inorganic filler, a first inorganic filler having a major axis and a minor axis. 
     
     
         5 . The coil component according to  claim 3 , wherein the insulating layer contains, as the inorganic filler, a second inorganic filler having a spherical shape. 
     
     
         6 . The coil component according to  claim 1 , wherein the resin has a glass transition temperature of higher than 150° C. 
     
     
         7 . The coil component according to  claim 1 ,
 wherein the base body has a first surface and a second surface opposite to the first surface,   the insulating layer is provided on the first surface, and   the external electrode is provided on the second surface.   
     
     
         8 . The coil component according to  claim 7 , wherein the insulating layer covers the entire first surface. 
     
     
         9 . The coil component according to  claim 7 , wherein the insulating layer extends from the first surface to a surface adjacent to the first surface. 
     
     
         10 . The coil component according to  claim 7 , wherein the external electrode extends from the second surface to a surface adjacent to the second surface. 
     
     
         11 . The coil component according to  claim 1 , wherein the insulating layer has a thickness of less than 10 μm.